Announcements for splines

splines – METAPOST macros for drawing cubic spline interpolants

This is a small package of macros for creating cubic spline
interpolants in METAPOST or METAFONT. Given a list of points the
macros can produce a closed or a relaxed spline joining them.
Given a list of function values y_j at x_j, the result would
define the graph of a cubic spline interpolating function y=f(x),
which is either periodic or relaxed.